Commutator-cylinder



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J. S. DEAN.

COMMUTATQR CYLINDER. APPLICATION FIITED JAN. 5. 1911.

1,329,267, Patented Jan. 27, 1920.

WITNESSES: INVENTOR v BY 7 A'l TORNEY John'fi Dean. i

JOHN S. DEAN, OF WILKINSBURG, PENNSYLVANIA, SIGNOR 'TO VJE H E ELECTRIC AND MANUFACTURING comranr, A oonroiaATioN or PENNSYLVANIA.

COMMUTATOB-CYLINDER.

Specification of Letters Patent. Patented Jai 2?,

Application filed January 5, 1917. Serial No. 140,744.

To all whom it may concern:

Be it known that I, JOHN S. DEAN, a citizen of the United States, and a resident of .Villzinslmrg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in commutator- Cylinders, of which the following is a specification.

My invention relates to commutator cylinders for dynamo-electric machines, and it has for its object to provide a commutator cylinder which shall embody means for causing the passage of ventilating currents over the active surfaces thereof.

In the construction of dynamo-electric machines, particularly of the railway motor type, it has heretofore beencustomary to mount sets of fan blades directly on the armature shaft of the motor for the purpose of causing the passage of ventilating currents from one end of the machine to the other. According to my invention, 1 provide a commutator cylinder mounted on the armature shaft which embodies a clamping ring provided with a plurality of integral fan blades that are adapted to force air over the surfaces of the commutator cylinder and over the adjacent portions of the machine.

In the accompanying drawings, Figure 1 is a transverse sectional view of a, portion of a commutator cylinder embodying my invention and Fig. 2 is an end view of the parts shown in Fig. 1, looking from left to right.

The commutator cylinder comprises alternate conducting and insulating segments 1 and 2, respectively, that are circumferentially arranged upon a spider 3 which is mounted upon a rotatable shaft 4. The spider 3 is provided, at one end, with a V- shaped projection 5 and a. clamping ring 6 having an annular V-shaped face which coacts with the portion 5 to maintain the segments 1 and 2 in proper relation upon the spider 3. Insulating material 7 is located between the segments 1 and 2 and the spider 3 and the clamping ring 6, respectively. The clamping ring 6 is provided with a portion 8 that projects beyond the ends of the segments 1 and 2, and a plurality of integral radially-extending fan blades 9 are circumferentially arranged upon the portion 8. A ring 10 of insulating material is interposed between the blades 9 and the adjacent ends of the segments 1 and 2 and comprises a substantially cylindrical portion 11 concentric with the. V-ring 8 and a laterally-extending annular portion 12 that is located in a groove 13 provided in the commutator segments 1 and 2. By reason of the fact that the blades 9 are so shaped as to extend over a considerable portion of the insulating material 11, a considerable saving in the length of the machine is effected.

From the foregoing, it is apparent that the rotation of the fan blades 9 with the armature shaft 4 will cause the passage of ventilating currents over the active surfaces of the commutator cylinder and over the adjacent portions of the motor (not shown). Furthermore, the insulating ring 10 will provide a creepage path extending from the outer periphery of the annular portion 12 to the nearest exposed ortion of the clamping ring 8, the length of this path being substantially the same as that usually provided between the ends of the conducting segments 1 and the clamping ring 8.

While I have shown my invention in a simple and preferred form, it is not so limited but is susceptible of various modifications within the scope of the appended claims.

I claim as my invention:

1. In a commutator cylinder, the combination with conducting and insulating segments, of a clamping ring therefor provided with a plurality of fan blades and an insulating member located intermediate said fan blades and said conducting segments, said fan blades overhanging said insulating member.

2. In a commutator cylinder, the combination with conducting and insulating segments, of a clamping ring therefor provided with a plurality of fan blades and an insulating member located intermediate said fan blades and said conducting segments and having portions thereof concen- 10o trio with said ring and in engagement with said segments, respectively, and located radially within portions of said fan blades.

3. In a commutator cylinder, the combination with conducting and insulating 105 segments, of a clamping ring therefor provided with a plurality of fan blades and a rmg of insulating material interposed between the said fan blades and the adjacent ends of said segments, portions of said fan 110 blades overhanging said ring of insulating material.

i 4:. In a commutator cylinder, the combination With conducting and insulating segments, of a clamping ring therefor provided With a plurality of fan blades and a ring of insulating material having a portion concentric with said ring and radially Within said blades andan annular portion 10 in engagement With said segments.

- 5; In a commutator cylinder, the combination With conducting and insulating segments, of a clamping ring therefor provided With a plurality of fan blades and a ring of insulating material located radially Within said blades and having a portion concentric With said ring and an annular portion projecting laterally beyond the surface of said ring and located in a groove provided in the ends of said segments.

In testimony whereof, I have hereunto subscribed my name this 29th day of Dec. 1916.

JOHN S. DEAN. 

